Fine Structure of the Spermatozoon in the Japanese Abalone, Haliotis discus

概要

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Spermatozoa of Haliotis discus were subjected to observations by light and electron microscopies. A differential interference microscope as well as a dark-field microscope was capable of distinguishing the acrosome from the nucleus. Observations of the live spermatozoa by the light microscopies confirmed in detail the overall figures of the sperm head observed by scanning or transmission electron microscopy. The acrosomal vesicle showing a length of 2.8 μm and a diameter of 1.1 μm contained two kinds of materials different in electron density. Around the apex of the acrosome, a trigger region of the acrosome reaction and a structure termed truncated cone were visible. The axial rod was shown to penetrate deeply into both the acrosomal vesicle and the nucleus in the opposite directions. The boundary between the acrosome and the nucleus exhibited a diamond-shaped region with the axial rod through it. The midpiece was composed of five mitochondria and a pair of centrioles being oriented orthogonally in the center of the midpiece. The proximal centriole was placed in a depression of nucleus at the posterior end and the distal centriole was associated with nine spokes, which connected the centriole with the mitochondria.
和洋女子大学の論文
1983-03-31